Mighty Morphin Morphology

I can't get it to work. When I do ctrl-M it does this:

An error occurred in an add-on.
Please post on the add-on forum:
https://anki.tenderapp.com/discussions/add-ons

Traceback (most recent call last):
File "C:\Users\rain\Documents\Anki\addons\morphman.py", line 6, in onMorphManRecalc
morph.main.main()
File "C:\Users\rain\Documents\Anki\addons\morph\main.py", line 265, in main
knownDb = updateNotes( allDb )
File "C:\Users\rain\Documents\Anki\addons\morph\main.py", line 230, in updateNotes
TAG.register( tagNames )
UnboundLocalError: local variable 'tagNames' referenced before assignment



I request aid.